—do you surf the Internet? — Once a week.A. How longB. How oftenC. How muchD. How far

问题补充：

—do you surf the Internet?

— Once a week.

A. How long

B. How often

C. How much

D. How far

答案：

A. How long

(答案→)B. How often

C. How much

D. How far

解析：How long多长；How far多远；How often多久一次；How much多少钱。根据下文，每周一次。可知上文提问的是频率，故选B。